Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D394663 | Spade-type boring bit having chamfered corner portions | Paul A. Stone, Rickey J. Thomas, Timothy T. McKenzie, Richard Alan Adams | 1998-05-26 |
| D376809 | Spade-type boring bit | Paul A. Stone, Rickey J. Thomas | 1996-12-24 |